Blue monoazo dyestuffs for wool or silk



ADOLPHE H. NEY, OF NEW YORK, N.

I we

N'llflll.

Y BLUE MONOAZO DYES TUFFS FOR WOOL OR SILK.

No Drawing.

It is well known that the amino diphenylamin mono-sulfonic acidof the following constitution -N- NH: H

which can be easily and cheaply prepared by condensing, by "means of acid binding media, the 1 :nitro-4 :'hlor-benzol-3 sulfonic acid with aniline and reducing the resulting nitro diphenyl-amin sulfonic acid, gives I valuable blue-black to deep-black diazo dyestufi's of the general formula: aminodiphenylamin-sulfonic acid-azo-a-naphthylamin-azo naphthol-sulfonic acid, or aminodiphenylamin-sulfonic acid-azo-a-naphthylamin azo naphthylaminsulfonic acid, or amino diphenylamin sulfonic acid-azo-anaphthylamin-azo-amino-naphthol sulfonic acid. Such dyestufis, Jmown under the name of Nerol1acid blacks, are commercial products and, owing to their desirable properties, are employed to a not inconsiderable extent, in spite of their somewhat higher price when-compared with other acid blacks.

The homologue of the amino-diphenylamin-sulfonic acid, obtained in an analogous.

manner by employing ortho-toluidine instead of aniline and having the following constitution -N NE,

E I om soul is also used for the production of black acid dyestufis similar to those referred to 0 above.

compound of 1 :8 amino-n'aphthol 32' 6 disulfonic acid, commonly called H-acid, pro- Application filed November 13, 1924.- Serial No. 749,784.

duces on W001 or silk in an acid'bath, brilliant and fast shades of blue of a reddish cast, that compare favorably with those produced by higher priced blue d estufis.

Example- 286 parts (by weig of the sodium salt of p-amino-dip enylam1n-mono-, sulfonlc acid are diazotized, by acidulating the solution, cooling .the same to 510 (3., and adding 7 parts sodium nitrite. After completed diazotization, the= diaz'o solution is combined with a cold solution containing 38.3 parts acetyl 1:8 amino-naphthol3':6 disulfonic acid (acetyl-H-acid) and sufiicient soda to produce an alkaline reaction at the end. The solution is then agitated for several hours. sary, is completely precipitated by the addition of salt, filtered and dried. I

The dyestuif thus obtained is a dark blue powder, easily soluble in water with a red,

dish blue color and producing, when dyed from an acid'bath, on wool or silk, brilliant blue shades ofa reddish cast, which do not change in artificial light, and are very fast to light, washing, carbonizing, and fast to fulling, milling, and alkali.

By substituting, in the example given above, the amino-diphenylamin-sulfonic acid by its homologue, the amino-phenyl-tolylamin-sulfonic acid, referred to above, a dye- The dyestufi, if neces- Y}, assrenon T0 'rnnononn HAEBLER, or new Yonx, n. Y. 1

stud of similar properties but of a purplish blue shade is obtained. lzamino-2zmethoxy-diphenylamin-3 sulfonic acid, obtained by condensing p-nitrochlor-benzol-mono-sul fonic acid with ortho-anisidine and reducin the resulting nitro-diphenylamin derivatlve, when diazotized and coupled with acetyl-H-acid gives a dyestufi of similar properties and very brilliant greenish blue shade.

Having described my invention, what claim is this:

1. As a new product, the monoazodyestufl", obtained by coupling in an'alkalme solution the thaw compound of lzaminodiphenylamin-3 sulfonic acid with 1 acetyl- I amino-8 hydroxy-naphthalene 3 6 sulfonic acid (acetyl-H-acid).

2. As a new product the monoazo dye stuff, obtained by coupling in an alkaline solution, diazotized lzamino-2": methyl diphenylamin-3zsulfonic acid with lzacetylamino --8 :hydroxymaphthalene 3 6 disulfonic acid, (acetyl-H-acid)-, said dyestufi dyeing wool and silk in bluish purple 110 shades fast to light, washing, carbonization, and'fulling.

3. *Monoazo dyestufls, having as first or diazo component a diphen lamin'derivative containing a sulfonic 'aci group in oi'thoposition to the imido group and as second or azo component, acetyl-H -acid. V

4. Azo-acid dyestufls, dyeing wool and silk level, fast to light, washing, carbonizing, falling, etc., and having as first component a diphenyl'amin derivative, derived from condensing p-nitro-chlor-benzol-suL fonic acidwith a compound having aniline characteristics, the said compound having a position para to the amino group free, and reducing the nitro-diphenylainin sulfonic acid thus obtained, and as second or amcomponent, acetyl-H-acid.

In testimony whereof I have hereunto set my hand.

ADOLPHE NEY. 

